辨析说话人的建议与要求 — 英语词汇题
题目
补全广播通知中符合说话人意图的句子：本广播宣布航班延误并给出建议（非强制）。'Attention please. Flight BA206 is delayed. Passengers ___ remain in the waiting area and are welcome to enjoy free coffee at the lounge.'（A) must (B) are advised to (C) are required to (D) cannot